The complete set of values of a so that ...

The complete set of values of a so that equation `sin ^(4) x +a sin ^(2) x+4 =0` has at least one real root is:

A

`(oo, -5]`

B

`(-oo, 4] uu [4, oo)`

C

`(-oo. -4]`

D

`[4,oo)`

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The correct Answer is:

A

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